Research On Cutting Performance Of Assembled Hardened Mold Steel With Toroidal Cutter

In recent years,mold demand is increasing with the development of aerospace,automobile,shipbuilding.Mold steel Cr12 Mo V is widely used in automobile covering mold manufacturing,couse with the characters of small deformation,wear resistance and adapt to the high pressure and long life.some part of the hardened steel mold which be impacted of durability need to harden the steel parts of a hardening for the impact of the larger parts of the durability.In order to ensure highquality mass production of automotive coverings,to improve the rigidity of hardened steel molds,improve durability and processing accuracy,etc.Hardened steel in the local hardening,the hardness difference between the various parts.This leads to the milling characteristics of subsequent semi-finishing and finishing become complex.The tool is prone to deformation and easy to accelerate the wear and tear of the tool.It is very important to study the tool performance in the process of stitching some workpieces,because it is difficult to guarantee the size precision and surface quality of the workpiece to be processed.In view of the above problems,the cutting force modeling,tool wear,tool life and surface quality of the toroidal milling cutter are studied.The main contents as follow:First of all,the toroidal milling cutter splice hardened steel cutting test is designed.The test parameters include the amount of cutting that has a significant effect on cutting forces,tool wear and machining quality,feed mode and the angle between the tool and the seam and so on.And provides data support for the subsequent analysis.These provide data support for subsequent analysis.Secondly,the cutting force model of toroidal milling cutter is established by using micro-element geometry method.The model can be used to predict the milling force of different hardness materials.The numerical simulation to the milling force is finished by using MATLAB.The accuracy of the model is verified by experiments.Then,the wear characteristics of spliced hardened steel by toroidal milling are studied.First,in the cutting edge gradually formed wear band,accompanied by a slight chipping.And then with the cutting of the progress,the wear area from the cutting edge gradually extended to the front and rear face,The front face gradually formed crescent depression,the flank face coating gradually fall off,wear area continues to expand,the tool base material to increase wear.Finally,until the tool crushing failure.The main wear mechanism is abrasive wear,and with the increase of wear and tear,the wear area of the flank is gradually increased,and it is gradually transformed into wear mechanism such as diffusion wear and oxidation wear.Finally,the surface quality of the toroidal milling cutter is studied.The influence of the cross seam way and the seam angle on the surface quality of the cutting zone and the influence of the tool wear on the cutting force and surface roughness were obtained to provide technical support for toroidal milling cutters in cutting and splicing hardened steel applications.